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Countercurrent immunoelectrophoresis in the evaluation of infants with group B streptococcal disease
Insights
Countercurrent immunoelectrophoresis (CIE) effectively detects Group B Streptococcus (GBS) antigens in infant CSF, serum, and urine. CIE is a valuable diagnostic and prognostic tool for GBS infections in neonates.
Area of Science:
- Neonatal infectious diseases
- Microbiology
- Immunology
Background:
- Group B Streptococcus (GBS) is a leading cause of neonatal sepsis and meningitis.
- Early and accurate diagnosis of GBS infections is critical for timely treatment and improved outcomes.
- Current diagnostic methods may have limitations in sensitivity and speed.
Purpose of the Study:
- To evaluate the utility of countercurrent immunoelectrophoresis (CIE) for detecting GBS antigens in various bodily fluids from infected infants.
- To assess the diagnostic and prognostic value of CIE in neonatal GBS infections.
- To correlate antigen detection and antigenuria duration with clinical outcomes in GBS meningitis.
Main Methods:
- Countercurrent immunoelectrophoresis (CIE) was used to test cerebrospinal fluid (CSF), serum, and urine specimens from 67 patients with proven GBS bacteremia and/or meningitis.
- Detection of both group-specific and type-specific GBS antigens was performed.
- Statistical analysis, including Mann-Whitney U tests, was employed to compare outcomes based on antigen levels and duration of antigenuria.
Main Results:
- GBS antigens were detected in 81% of CSF, 63% of serum, and 96% of concentrated urine specimens.
- All infants with meningitis (n=26) and bacteremia (n=10) tested had GBS antigens detected in at least one specimen.
- In type III GBS meningitis, higher CSF antigen concentration and longer antigenuria duration correlated with fatal outcomes or neurologic sequelae (P < .05).
Conclusions:
- CIE is a sensitive and specific method for rapid GBS antigen detection in CSF, serum, and urine of infants.
- Examining multiple specimen types and using high-titered antisera enhances diagnostic accuracy.
- CIE serves as a valuable tool for both diagnosing GBS infections and predicting patient prognosis in neonates.
Abstract:
Admission specimens of CSF, serum, and urine from 67 patients with proved group B streptococcal (GBS) bacteremia and/or meningitis were evaluated by countercurrent immunoelectrophoresis (CIE). Group B and type-specific antigens were detected in 81% of CSF, 63% of serum, and 96% of concentrated urine specimens by CIE. Each of 26 infants with meningitis from whom all three body fluids were available and ten with bacteremia from whom both serum and urine were collected at admission had GBS antigens detected by CIE in at least one specimen. No false positive reactions were observed. Among patients with type III, GBS meningeal infection, fatal outcome or neurologic sequelae were significantly correlated with concentration of type III antigen in admission CSF and duration of antigenuria when compared to normal survivors (P = less than .05, Mann-Whitney U tests). CIE appears to be a useful diagnostic and prognostic tool for infants with GBS infection if admission specimens from more than one source are examined and appropriately high-titered antisera are employed for testing.